Hard disk drive indicator blinks once every second - ThinkPad

The HDD (Hard Disk Drive) indicator light may blink quickly once every second.

Affected configurations

All ThinkPad systems.

Solution

This is normal behavior.

This indicator, also known as the Device Access or Drive in Use indicator, also shows the status of the CD/DVD drive in the system. A feature of Windows called Autorun may cause this indicator to turn on briefly approximately once every second.